$18\left(6^{-1}\right)$

$\lim_{x\to2}\left(\frac{6\cdot x}{\left|x-2\right|}\right)$

$\frac{3}{7}xy-\frac{7}{6}xy+\frac{5}{14}xy$

$\lim_{x\to1}\left(\frac{1}{x\cdot1-x}\right)$

$\frac{x^9+8}{x^3+2}$

$\int\left(9\sec\left(x\right)\cos\left(x\right)\right)dx$

$\int\left(\frac{2z}{e^2}\right)dz$